Question

I’m going to dynamically change the protocols in source of all pages on Blogger.

Eg All http:// change to https:// on below items:

• <link rel="..." type="..." href="http://www.blogger.com/..." />
• <script src="http://www.blogger.com/..."></script>
• <iframe src="http://www.blogger.com/..."></iframe>
• <a href='http://www.blogger.com/...'></a>
• And if possible on internal javascript variables

Answer 1

The best choice for you is using Protocol-Relative aka Protocol-Agnostic urls:

<link rel="..." type="..." href="//www.blogger.com/..." />
<script src="//www.blogger.com/..."></script>
<iframe src="//www.blogger.com/..."></iframe>
<a href='//www.blogger.com/...'></a>

So no need to change anything dynamically.